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Loans - Aging of Recorded Investment in Past Due Loans(Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | $ 25,241 |  | $ 26,591 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 17,776 | [1] | 24,050 | [2]
Total past due |  | 43,017 |  | 50,641 |
Total current (2) |  | 5,346,125 |  | 5,236,189 |
Recorded Investment |  | 5,389,142 |  | 5,286,830 |
Commercial, financial and agricultural |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 145 |  | 371 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 1,043 | [1] | 4,113 | [2]
Total past due |  | 1,188 |  | 4,484 |
Total current (2) |  | 1,056,678 |  | 993,693 |
Recorded Investment | [3] | 1,057,866 |  | 998,177 |
Commercial real estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 856 |  | 355 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 2,360 | [1] | 2,499 | [2]
Total past due |  | 3,216 |  | 2,854 |
Total current (2) |  | 1,168,674 |  | 1,157,010 |
Recorded Investment | [3] | 1,171,890 |  | 1,159,864 |
Construction real estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Recorded Investment |  | 182,017 |  | 189,466 |
Commercial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 29 |  |  |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) | [2] |  |  | 541 |
Total past due |  | 29 |  | 541 |
Total current (2) |  | 125,761 |  | 135,200 |
Recorded Investment |  | 125,790 |  | 135,741 |
Mortgage |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 256 |  | 559 |
Total past due |  | 256 |  | 559 |
Total current (2) |  | 52,080 |  | 48,246 |
Recorded Investment |  | 52,336 |  | 48,805 |
Installment |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 54 |  | 223 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 19 | [1] | 64 | [2]
Total past due |  | 73 |  | 287 |
Total current (2) |  | 3,818 |  | 4,633 |
Recorded Investment |  | 3,891 |  | 4,920 |
Commercial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 16 |  | 330 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 1,586 | [1] | 3,631 | [2]
Total past due |  | 1,602 |  | 3,961 |
Total current (2) |  | 392,521 |  | 403,666 |
Recorded Investment |  | 394,123 |  | 407,627 |
Mortgage |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 11,515 |  | 10,854 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 9,232 | [1] | 9,769 | [2]
Total past due |  | 20,747 |  | 20,623 |
Total current (2) |  | 1,091,195 |  | 1,150,331 |
Recorded Investment |  | 1,111,942 |  | 1,170,954 |
HELOC |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 616 |  | 970 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 876 | [1] | 1,020 | [2]
Total past due |  | 1,492 |  | 1,990 |
Total current (2) |  | 202,660 |  | 211,304 |
Recorded Investment |  | 204,152 |  | 213,294 |
Installment |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 239 |  | 350 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 253 | [1] | 319 | [2]
Total past due |  | 492 |  | 669 |
Total current (2) |  | 18,087 |  | 19,272 |
Recorded Investment |  | 18,579 |  | 19,941 |
Consumer |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Accruing loans past due 30-89 days |  | 11,515 |  | 12,579 |
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) |  | 2,407 | [1] | 2,094 | [2]
Total past due |  | 13,922 |  | 14,673 |
Total current (2) |  | 1,231,622 |  | 1,109,562 |
Recorded Investment |  | 1,245,544 |  | 1,124,235 |
Leases |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total current (2) |  | 3,029 |  | 3,272 |
Recorded Investment |  | $ 3,029 |  | $ 3,272 |
[1] | (1) Includes an aggregate of $1.8 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.(2) Includes an aggregate of $56.1 million of nonaccrual loans which are current in regards to contractual principal and interest payments.
[2] | (1) Includes an aggregate of $2.1 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.(2) Includes an aggregate of $65.9 million of nonaccrual loans which are current in regards to contractual principal and interest payments.
[3] | Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.

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